Question 1

FIGURE 19-8 
-Three equal point charges of varying signs are placed on the corners of a square of side d as shown in Figure 19-8. Which of the arrows shown represents the direction of the net electric field at the center of the square?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
E)  none of the above

Question 2

FIGURE 19-10 
-Three equal point charges are placed at three of the corners of a square of side d as shown in Figure 19-10. Which of the arrows shown represents the direction of the net electric field at the vacant corner of the square?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
E)  none of the above

Question 3

Q₁ = 6.0 nC is at (0.30 m, 0); Q₂ = -1.0 nC is at (0, 0.10 m); Q₃ = 5.0 nC is at (0, 0). What is the magnitude and direction of the net force on the 5.0 nC charge?

Accepted Answer

The answer of Q₁ = 6.0 nC is at (0.30...

Question 4

A good conductor of electricity is a bad conductor of heat.

Accepted Answer

A) True 
 B)False

Question 5

When the distance between the two charges is doubled, the force between them is

Accepted Answer

A)  doubled. 
B)  quadrupled. 
C)  reduced by a factor of 3. 
D)  reduced by a factor of  . 
E)  reduced by a factor of 4.

Question 6

Two objects, A and B, are rubbed together. As a result, object A acquires an excess negative charge while object B becomes positively charged. In comparison to their masses before the charging process, you can say that

Accepted Answer

A)  the mass of both objects increased. 
B)  the mass of A increased and that of B decreased. 
C)  the mass of A decreased and that of B increased. 
D)  the mass of both objects decreased. 
E)  None of the other choices is correct.

Question 7

The charge carried by one electron is e = -1.6 × 10-19 C. The number of electrons necessary to produce a charge of -1.0 C is

Accepted Answer

A)  6.3 × 1018. 
B)  6.3 × 109. 
C)  1.6 × 1019. 
D)  1.6 × 109. 
E)  none of the above

Question 8

Two charges, Q1 and Q2, are separated by a certain distance R. If the magnitudes of the charges are halved, and their separation is also halved, then what happens to the electrical force between these charges?

Accepted Answer

A)  It increases by a factor of 16. 
B)  It increases by a factor of 8. 
C)  It is doubled. 
D)  It is quadrupled. 
E)  It remains the same.

Exam 19: Electric Charges, Forces, and Fields

FIGURE 19-8 -Three equal point charges of varying signs are placed on the corners of a square of side d as shown in Figure 19-8. Which of the arrows shown represents the direction of the net electric field at the center of the square?

FIGURE 19-10 -Three equal point charges are placed at three of the corners of a square of side d as shown in Figure 19-10. Which of the arrows shown represents the direction of the net electric field at the vacant corner of the square?

Q₁ = 6.0 nC is at (0.30 m, 0); Q₂ = -1.0 nC is at (0, 0.10 m); Q₃ = 5.0 nC is at (0, 0). What is the magnitude and direction of the net force on the 5.0 nC charge?

A good conductor of electricity is a bad conductor of heat.

When the distance between the two charges is doubled, the force between them is

Two objects, A and B, are rubbed together. As a result, object A acquires an excess negative charge while object B becomes positively charged. In comparison to their masses before the charging process, you can say that

The charge carried by one electron is e = -1.6 × 10^-19 C. The number of electrons necessary to produce a charge of -1.0 C is

Two charges, Q₁ and Q₂, are separated by a certain distance R. If the magnitudes of the charges are halved, and their separation is also halved, then what happens to the electrical force between these charges?

Exam 19: Electric Charges, Forces, and Fields

FIGURE 19-8 -Three equal point charges of varying signs are placed on the corners of a square of side d as shown in Figure 19-8. Which of the arrows shown represents the direction of the net electric field at the center of the square?

FIGURE 19-10 -Three equal point charges are placed at three of the corners of a square of side d as shown in Figure 19-10. Which of the arrows shown represents the direction of the net electric field at the vacant corner of the square?

Q1 = 6.0 nC is at (0.30 m, 0); Q2 = -1.0 nC is at (0, 0.10 m); Q3 = 5.0 nC is at (0, 0). What is the magnitude and direction of the net force on the 5.0 nC charge?

A good conductor of electricity is a bad conductor of heat.

When the distance between the two charges is doubled, the force between them is

Two objects, A and B, are rubbed together. As a result, object A acquires an excess negative charge while object B becomes positively charged. In comparison to their masses before the charging process, you can say that

The charge carried by one electron is e = -1.6 × 10-19 C. The number of electrons necessary to produce a charge of -1.0 C is

Two charges, Q1 and Q2, are separated by a certain distance R. If the magnitudes of the charges are halved, and their separation is also halved, then what happens to the electrical force between these charges?

Q₁ = 6.0 nC is at (0.30 m, 0); Q₂ = -1.0 nC is at (0, 0.10 m); Q₃ = 5.0 nC is at (0, 0). What is the magnitude and direction of the net force on the 5.0 nC charge?

The charge carried by one electron is e = -1.6 × 10^-19 C. The number of electrons necessary to produce a charge of -1.0 C is

Two charges, Q₁ and Q₂, are separated by a certain distance R. If the magnitudes of the charges are halved, and their separation is also halved, then what happens to the electrical force between these charges?